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Viral detection of bursae collected from the chickens after challenge
| Groups | Day 5 | Day 7 | Day 9 | Day 12 | Day 16 |
|---|---|---|---|---|---|
| HPE high-dose group | +a | + | + | − | − |
| HPE middle-dose group | + | + | + | − | − |
| HPE low-dose group | + | + | + | + | − |
| Egg-yolk antibody Igy control group | + | + | + | − | − |
| Positive control group | + | + | + | + | − |
| Negative control group | − | − | − | − | − |
Symbols: + — represents positive viral isolation; − — represents negative viral isolation.
